Construction of carburetors



Filed May 2, 1931 3 Sheets-Sheet 1 INVENTOR BY M {xi x AHomey May 30,1933. E. MATHIEU 1,911,838

CONSTRUCTION OF GARBURETORS Filed May 2, 1931 3 Sheets-Sheet 2 May 30,1933. E. MATHIEU CONSTRUCTION OF CARBURETORS Filed May 2, 1931 3Sheets-Sheet 3 A //IIIIIIIIIIIL Eugne. Medh U INVEN Patented May 30,1933 PATENT oFrIcE EUGEN MATHI U, or N UILLY-sna-snmn; FRANCE Q'ooNsrRncTIoiv or cnannnn'rons Application iiled 'MaYZ, 1931,-Seria1 No.534,466, and in France May 14, 1930.

My invention relates to carburetors for internal combustionengines andit has chiefly for its object to provide an improved mode ofconstruction making it possible to readily mount and dismount thecarburetor so as to permit easy access to the main nozzle and to theidling nozzle, and also to the inside. of the float chamber, withoutmaking it necessary to dismount the pipe that serves to con- Vey themixture to the cylinders or the air oonduitthat is eventually connectedto the air purifier or the air preheater.

The carburetor according to my invention is formed of two partsconnected to each other in a detachable manner. The first part comprisesthe mixture inlet pipe together with its throttle, the gasoline inletpipe and eventually the air purifier and/or preheater; The other partcomprises the float chamber,

the main nozzle, the idling nozzle, andv the part of the wall of theinletconduit that carries these nozzles. 1 Q 7' According toanothercharacteristic-of my invention, the float is; provided 01120119side with a horizontal gulding organ the endsoi;

which are adapted to slide in groovespro: vided in the wall'ofthe floatchamber, a finger being rigidly connected to said float and bearingagainst the lower end of the needle valvewhich controls the gasolinefeed.

In order to ensure the free displacement .of the needle valve withoutany possibility of wedging, and to obtain a fluidtight obturation of thegasoline inlet conduit when the needle valve is applied against itsseat,

said needle valve preferably consists of a rod mounted with a certainplay in a bore provided in a boss of the cover of the float chamher andlocated below the needle valve seat. Said needle valve is adapted toengage a spherical or similar recess provided in a coaxial push pieceguided without play in a.

' ber is screwed in the central-part of boss 9,

prolonged part of said bore and on the lower end of which the abovementioned fin- 5 ger rigidly connected to the float isapplied.

I Another important characteristic of my invention consists in thedetachable connection between the two elements of the carburetor.

Apreferred embodiment of my. invention li of Fig. 2.

will be hereinafter described with-reference to the appended drawings,givenmerely by way of example, and in which: i

Fig. 1 isan elevational view of the ca rbu-.. m a

. Fig. 2 is a corresponding longitudinal sec tion; A

Fig. 3 is a sectional view on of-Fig. 2, and

Fig. itis a horizontal section. on the line the line The carburetorshown theaccompany .ing drawings comprises two parts 1 and 2 assembled;along joiningsurfaces a be. d of Fig. 1 Part 1 comprises an inletconduit 3 5, provided with, a flange 1 adapted to be secured to theflange ofthe inlet pipe leading to the cylinders, and having aright-angular bent portionprovided with a flange 5 adapted to 'besecured toa flange 6 connected to an air purifier 7 .(or anairpreheater) secured to the engine; The gas throttle 8 is mountedinside conduit 3. 1 i 1 l Part1 is provided with a boss 9 through whichpasses a gasoline inlet conduit 10, said "I? bossbeing cast on theinside of the cover 11 of float chamber 12 (said float chamber is a partof unit 2) At the end of conduit 10, a coupling 13 is screwed, saidcoupling being connected with the gasoline inlet pipe. 81}

Part 2 comprises float chamber 12, a boss 13a extending laterally fromthe wall of said chamber (see particularly Fig. .4) and in which areprovided bores for the idling nozzle 14, and a wall 15 supporting themain nozzle 16 and adapted to complete thewall ofcons duit 3 in theregion where" said conduit 8 is bent at right angles. I v

The two elements 1 and 2 are connected to each .other in va detachablemanner, for in-. stance as follows: i i The threadedend 17 of asupporting memof rod 20 is bent at 23 so as to form an operating lever,and thecentral part'of said rod. 1

is cranked. The holes 19 are also eccentrically located with respect tothe axis of bearings 2122, so that in the position shown in Fig. 3, part24 is elastically applied against lugs 18, which keeps the two elements1 and 2 assembled by an elastic pressure.

By rotating rod 23 through 180, the cranked part 24 also rotates through180,

and, in its new position, it is no longer in contact with support 17owing to the eccentricity of holes 19. To take the carburetor to pieces,

it then suffices to pull lever 23-toward the.

so as to disengage rod 20 from and at its upper part a support 26through which'pass'e's a guiding rod 27 the ends of which en 'agegrooves 28 providedin thewall of'float chamber 12. Support 26 isprovided with a finger 29 extending toward the center of the floatandadapted to control the d-is-.

placements of needle valve 30. 7 x

Said needlevalve 30 cooperates with a sea 31 integral with, a piece 32screwed in boss 9, and whose centralbore, through which needle valve 30is adapted to move, has "a greater diameter than said needle valve, soas to pro-- vide an annular passage 33 for the gasoline,

said gasoline being evacuated through'in clinedconduits 34. The lowerend of needle valve 30 has a spherical or equivalent shape and rests ina spherical recess of the head 35 of a push piece 36, the lower end ofwhich projects from piece 32, so as to be in contact with finger 29.Head35 is guided without play in the'central bore of-piece 32, andthehole through which passes the lower end of push piece 36 has a smallerdiameter than head 35 so as to prevent said push piece from leavingpiece 32. 4 7

The operation of that device is as follows: When the level of gasolinein float chamber 12 is below the normal level N'N, float 25 moves downby pivoting about rod 27, the ends of which are applied against thebottoms of grooves 28. It results therefrom that arm 29 rotates in ananti-clockwise direction and allows needle valve30 to move down awayfrom its seat 31, which causes gasoline to flow from conduit 10 intofloat chamber 12. When the gasoline level rises in float chamber'12, thefloat moves in an upward direction and finger 29 lifts needle valve 30until it is applied'against its seat. During that movement finger 29bears against push piece 36, and rod 27 remains applied against thebottom of groove 28 owing to the position of thecenter of gravity of thefloat. If necessary, the ends of guiding rod 27 can be upwardly bent soas to fill up grooves 28 the upper ends of the bent parts of said rodbeing then applied against the under side of cover 11.

It is pointed out that, owing to that mode of construction, the takingto pieces of the carburetor is greatly facilitated. It is only necessaryto separatecover 11 from float chamber 12 to remove float 25 by takinghold of finger. 29. The different organs that go to formthe needle" valve' are also very easy to reach, it being given that itsufiices tounscrew piece 32. H Owingvtorthe combinationof needle valve 30 and ofpush piece 36, the needle valve is guided in the correctgmanne'r withoutany possibility of jamming, while leaving afree" space for the flow ofgasoline, and itmoves always parallelly to itself, whichensuresafluid-tight obturationfof the gasolineginlet conduit, inspite ofthepivoting motion of finger29.- i i' While I have disclosed what I-deem to "be the preferred form of,my-device, I' do not wish to belimited thereto as there might be changes made in the arrangement,disposition and form of the part; forinstancethe device for connectingtogether the two units that form the carburetor,'the mode ofconstruction of the float -chamberfwith its float and its needle valvemight be used in connection with the other types of carburetors withoutdeparting from the principle of my invention as comprehended'within thescope of the ap-' pended claims. I t

'What Icl'aim -is: 7 I 1 i 1. A carburetor comprising two separateunits, *one unit comprising a float chamber, a main nozzle, an idlingnozzle, said unit also comprisingmeans for supporting said noz zlejs,the other unit comprising a conduit for conveying'the mixture to theengine manifold, athrottle in said on-duit, a cover for.v

the float chamber, and a-gasoline inlet conduit providedinfsaid cover,the carburetor further comprising a boss projecting downwardly-from saidcover and provided'witha hole, an elastic crank rod for engaging said"hole and slidably and pivotally mounted in the walls of thefloat chamberabout an axis distinct'from the axis of said hole, said rod extendingexteriorly of said float chamber and being bent substantially at rightangles so as to form an operating lever, whereby thetwo units can bereadil" "assembledtogetheror separated from eac other.

2. A carburetor according to claim 1 further comprising a needlevalvefor controlling the gasoline feed and projecting downwardly from saidcover, a float pivotally mounted in said float chamber, and a fingerrigidly mounted on" one side of the upper part of'said float adapted tocooperate with said needle valve. p 3."A*carburetor comprising a floatchamber, provided with two vertical grooves in its inner surface, acover for said float chamber, a gasoline inlet conduit in said cover, abore through said cover extending downwardly from said conduit, aplurality of inclined conduits connecting the intermediate part of saidbore to the inside of said float chamber, a needle valve having adiameter substantially smaller than that of said bore slidably mountedtherein, a seat for said needle valve at the upper part of said bore, a

the lower end of said needle valve being rounded, a push piece having adiameter substantially equal to that of said bore slidably mountedtherein below said needle valve, the upper part of said push pieceforming a rounded recess adapted to cooperate with the lower part ofsaid needle valve, a float in said float chamber, a finger rigidlysecured to the upper part of said float, a guiding 7 rod secured to saidfinger with its ends engaging said grooves, said finger being adapted tocooperate with the lower end of said push piece.

4. In a carburetor, a float chamber, a cover for said float chamber, agasoline inlet conduit provided in said cover and disconnectable meansfor assembling said chamber and said cover, said means comprising anelastic transverse rod pivotally and slidably mounted in the walls ofthe float chamber, a central boss projecting downwardly from said cover,and provided with a hole, the axis of which is eccentric with regard tosaid rod, said rod having a crank engaging said eccentric hole and meansfor operating said rod from the outside.

5. A carburetor comprising a float chamber provided with two verticalgrooves at the top of its inner surface, a cover for said float chamber,a gasoline inlet conduit in said cover, a needle valve slidably mountedin said cover for controlling the flow of gasoline through said gasolineinlet conduit, a float in said float chamber, a finger rigidly securedto the upper part of said float, a rod guided in said cover fortransmitting the motion of said finger to said needle valve and ahorizontal guiding rod secured to said finger with its ends engagingthebottom of said vertical grooves, whereby said float is pivotally mountedin said float chamber.

In testimony whereof I have signed my name to this specification.

EUGENE MATHIEU.

